Javascript new set

In JavaScript, Set is a built-in data structure that allows you to store unique values. Here's an overview of how to use it:

Creating a Set

You can create a new Set using the new Set() constructor:

const mySet = new Set();

Alternatively, you can create a Set from an array or an iterable using the Set() function:

const mySet = new Set([1, 2, 3, 4, 5]);

Adding elements to a Set

You can add elements to a Set using the add() method:

mySet.add(6);
mySet.add(7);

Checking if an element is in a Set

You can check if an element is in a Set using the has() method:

console.log(mySet.has(6)); // true
console.log(mySet.has(8)); // false

Removing elements from a Set

You can remove an element from a Set using the delete() method:

mySet.delete(6);

Iterating over a Set

You can iterate over a Set using a for...of loop:

for (const element of mySet) {
  console.log(element);
}

Set operations

Sets support various operations, including:

• Union: mySet.union(otherSet) returns a new Set containing all elements from both sets.
• Intersection: mySet.intersection(otherSet) returns a new Set containing all elements common to both sets.
• Difference: mySet.difference(otherSet) returns a new Set containing all elements in mySet that are not in otherSet.
• Symmetric difference: mySet.symmetricDifference(otherSet) returns a new Set containing all elements that are in either mySet or otherSet, but not in both.

Here's an example:

const setA = new Set([1, 2, 3]);
const setB = new Set([2, 3, 4]);

console.log(setA.union(setB)); // Set {1, 2, 3, 4}
console.log(setA.intersection(setB)); // Set {2, 3}
console.log(setA.difference(setB)); // Set {1}
console.log(setA.symmetricDifference(setB)); // Set {1, 4}